This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Allis Chalmers > Construction and other equipment
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


Allis Chalmers HD5 cylinder head cracked
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
hodaka View Drop Down
Bronze Level
Bronze Level


Joined: 26 May 2019
Location: Illinois
Points: 30 		Post Options Post Options   Thanks (0) Thanks(0)   Quote hodaka Quote  Post ReplyReply Direct Link To This Post Topic: Allis Chalmers HD5 cylinder head cracked
    Posted: 28 May 2019 at 10:56pm
While disassembling the engine in my HD5 I was cleaning and inspecting the cylinder head I noticed it is cracked between the exhaust seats and the injector tube. Is this a common problem with these engines? Is it repairable or should I find a different head?
Back to Top
Sponsored Links


Back to Top
DMiller View Drop Down
Orange Level Access
Orange Level Access


Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 33152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2019 at 6:44am
2-71 Detroit I take it? The head can be repaired or exchanged, try Chapin Cyl Head Chapin IL.
Back to Top
hodaka View Drop Down
Bronze Level
Bronze Level


Joined: 26 May 2019
Location: Illinois
Points: 30 		Post Options Post Options   Thanks (0) Thanks(0)   Quote hodaka Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2019 at 1:11pm
yes it is a Detroit 2-71. Thanks for the info. Will check them out
Back to Top
DiyDave View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 53310 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2019 at 5:52pm
[TUBE]Pq0wfU4ZaKk[/TUBE]
Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
Back to Top
Eric B View Drop Down
Orange Level
Orange Level
Avatar

Joined: 09 Feb 2012
Location: British Columbi
Points: 965 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Eric B Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2019 at 7:10pm
I take it you've been running this machine yourself? If so, you would know if you've had coolant leaking somewhere? I've had many Detroits over the decades and nearly every time I would pull a head there would be small cracks around the injectors. The first few times I would have the heads repaired or exchanged. After a few years I thought just a minute here... I've never had a coolant leak from these tiny cracks. One time after I had a head repaired and rebuilt spending good money I decided to do a full in-frame. The same head came off after only a few hours and wouldn't you know cracks were present again. Ever after that when I removed a Detroit head and noticed those tiny cracks I just put the heads back on and never had a problem whatsoever. That doesn't mean that any or every crack is problem free but I wasn't going to play the guilt game the machine shop would use to get more work. Unless the the crack or cracks in your situation go all the way to the injector tube or to the valve seat I would re-use the head the way it is. You can take the head in and have it pressure tested and then you will know.  




 




 
Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
Back to Top
hodaka View Drop Down
Bronze Level
Bronze Level


Joined: 26 May 2019
Location: Illinois
Points: 30 		Post Options Post Options   Thanks (0) Thanks(0)   Quote hodaka Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2019 at 10:57am
Thanks Ive only run this machine from the trailer to my shop. It would barely run.  The crack is pretty significant. I can almost get my fingernail in it.  It runs all the way from the injector tube to the exhaust seat.  
Back to Top
Eric B View Drop Down
Orange Level
Orange Level
Avatar

Joined: 09 Feb 2012
Location: British Columbi
Points: 965 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Eric B Quote  Post ReplyReply Direct Link To This Post Posted: 30 May 2019 at 5:55pm
Originally posted by hodaka hodaka wrote:

Thanks Ive only run this machine from the trailer to my shop. It would barely run.  The crack is pretty significant. I can almost get my fingernail in it.  It runs all the way from the injector tube to the exhaust seat.  

 That is a good size crack, if you don't want to spend the money on repairing the head you might find a good used one for a reasonable price.
Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
Back to Top
Coke-in-MN View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: Afton MN
Points: 41834 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2019 at 12:20pm
This is a real common flaw it seems in the heads - crack from copper injector seat outward . UNLESS it shows sign of coollant bubbles or loss or overheating - RUN IT . 
 I had my head repaired as the valve seat also showed signs of problem and the shop I had grinding and replacing valve said they would not put new seat in with the crack - also they were not familiar with 71 heads  
  So got a rebuilt head - with new injector tubes and new guides and seats - used 4 new valves and good to go 
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
Back to Top
Coke-in-MN View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: Afton MN
Points: 41834 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2019 at 12:23pm

Diesel Cast Welding

Diesel Cast Welding offers the nation's largest and most complete inventory of new & remanufactured diesel cylinder heads, diesel cylinder blocks and connecting rods.
‎Catalog · ‎New Heads · ‎Contact · ‎About
Blaine, MN. Diesel Cast Welding 2190 107th Lane NE Blaine, MN 55449. PH 763-780-5940. FAX 763-780-5646 dcwhome@dieselcastwelding.com.
Contact the location nearest you. Blaine, MN: 763-780-5940. Portland, OR: 503-282-3909. Search for: Home · Catalog · General Motors Cylinder Heads ...
Blaine, MN: 763-780-5940 ... for the excellent reputation DCW has earned in the field of cast iron repair. ... Q: What is the warranty on a welded head or block?
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
Back to Top
Coke-in-MN View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 12 Sep 2009
Location: Afton MN
Points: 41834 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2019 at 11:03am
I have a complete 2-71 engine (core) that came with one machine I bought as a extra said low oil pressure so  former owner replaced it with a engine from generator - never opened it up myself .  
  Will sell as is .
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
Back to Top
DMiller View Drop Down
Orange Level Access
Orange Level Access


Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 33152 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 02 Jun 2019 at 12:44pm
Hard for a engine with usually 5-25 lbs oil pressure to have 'Low' oil pressure!!!
Back to Top
Eric B View Drop Down
Orange Level
Orange Level
Avatar

Joined: 09 Feb 2012
Location: British Columbi
Points: 965 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Eric B Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2019 at 5:58pm
Originally posted by DMiller DMiller wrote:

Hard for a engine with usually 5-25 lbs oil pressure to have 'Low' oil pressure!!!
Years ago I had a 6V53 Detroit that used to come right down to "0" oil pressure at idle in summer heat... did not sit well with me. I was told by knowledgable Detroit people that if you don't reach 30 lbs  oil pressure at governed RPM you are playing with trouble and rebuilding is in order. (I guess I'm a little off topic for this thread).
Currently- WD,WC,3WF's,2 D14's B. Previously- I 600,TL745,200,FL9,FR12,H3,816 LBH. Earth has no sorrow that Heaven cannot heal!
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.078 seconds.


Help Support the
Unofficial Allis Forum